Water-based crazy horse resin and preparation method thereof

Abstract

The invention relates to the technical field of resin, and provides water-based crazy-horse resin and a preparation method thereof.The water-based crazy-horse resin is prepared from, by mass, 30-40 parts of polyester resin; the modified crazy horse resin is 10 to 20 parts; 1 to 5 parts of a photocatalyst; 5 to 10 parts of an emulsifier; 5 to 10 parts of a solvent; 39 to 50 parts of water; wherein the photocatalyst comprises titanium dioxide. By optimizing material selection and proportion, the water-based crazy horse resin disclosed by the invention not only has excellent wear resistance, adhesive force and flexibility, but also has excellent ultraviolet resistance, anti-aging effect, self-cleaning performance, antifouling performance and low maintenance performance, meanwhile, has environment-friendly and safe performance, meets the modern green manufacturing requirements, and can adapt to various application scenes.

Description

Technical Field

[0001] The invention relates to the technical field of resins, in particular to a water-based crazy horse resin and a preparation method thereof. Background Art

[0002] Water-based Crazy Horse resin is a resin coating material widely used in leather processing, especially for Crazy Horse leather. Crazy horse leather itself is a specially treated cow leather, which is characterized by a retro, rough texture and feel. This leather will form wear marks after long-term use. Therefore, a layer of Crazy Horse resin coating is usually applied on the surface of Crazy Horse leather to form a protective layer to extend the service life of Crazy Horse leather products.

[0003] However, crazy horse leather products are prone to absorb dust, oil and other pollutants during use, which will affect the appearance and service life. The surface of traditional crazy horse leather products is mostly matte, and pollutants are difficult to remove. The cleaning process may damage the leather texture. The water-based crazy horse resin used as a coating mainly focuses on wear resistance and cannot meet consumers' demand for its cleaning ability. Therefore, it is urgent to provide a water-based crazy horse resin with better cleaning ability. Summary of the invention

[0004] The present invention aims to solve at least one of the above technical problems.

[0005] To this end, the first object of the present invention is to provide a water-based crazy horse resin.

[0006] The second object of the present invention is to provide a method for preparing an aqueous treatment agent.

[0007] To achieve the first purpose of the present invention, the present invention provides a water-based crazy horse resin, which includes, by mass, 30-40 parts of polyester resin; 10-20 parts of the modified crazy horse resin; 1-5 parts of photocatalyst; 5-10 parts of emulsifier; 5-10 parts of solvent; 39-50 parts of water; wherein the photocatalyst includes titanium dioxide.

[0008] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the water-based crazy horse resin of the present invention, through a specific material combination, ensures the wear resistance of the water-based crazy horse resin while giving the water-based crazy horse resin self-cleaning ability; the polyester resin has excellent mechanical properties, provides good adhesion and wear resistance, and makes the crazy horse resin more firm on the leather surface and not easy to peel off; the modified crazy horse resin provides stronger flexibility and elasticity, and has better compatibility with the leather substrate, so that the coating is not easy to crack or fall off; the photocatalyst can make the crazy horse resin produce free radicals with strong oxidizing ability under light, decompose stains and organic matter attached to the leather surface, thereby enhancing the self-cleaning function of the leather surface and reducing maintenance costs; the photocatalyst uses titanium dioxide, which can not only decompose organic pollutants under light to form a protective layer to reduce the impact of light aging, but also improve the leather The anti-ultraviolet performance can prevent fading, hardening and brittleness caused by sunlight, and extend the service life of the product; the emulsifier can provide system stability for the water-based crazy horse resin, so that the polyester resin and the modified crazy horse resin are evenly dispersed in the water phase, ensuring the coating uniformity of the product; the use of a small amount of solvent can optimize the film-forming property and coating performance, and avoid the environmental pollution and health hazards caused by traditional solvent-based resins; water is used as the main dispersion medium to greatly reduce VOC (volatile organic compound) emissions, which meets environmental protection and safe production requirements; the water-based crazy horse resin of the present invention not only has excellent wear resistance, adhesion and flexibility by optimizing material selection and proportion, but also has excellent anti-ultraviolet performance, anti-aging effect, self-cleaning, anti-fouling and low maintenance performance, while also having environmental protection and safety performance, meeting modern green manufacturing requirements, and can adapt to a variety of application scenarios.

[0009] In addition, the technical solution provided by the present invention may also have the following technical features:

[0010] In one technical solution of the present invention, the modified crazy horse resin is modified by ethyl acetate.

[0011] Compared with the existing technology, the technical effect achieved by adopting this technical scheme is: ethyl acetate is a small molecule ester solvent with good plasticizing effect and low boiling point, which helps to reduce VOC emissions. Using ethyl acetate to modify crazy horse resin can reduce the cohesive energy density of the resin, adjust the polarity of crazy horse resin, reduce the viscosity of crazy horse resin, and optimize the molecular structure of crazy horse resin, thereby improving the cross-linking density and toughness of water-based crazy horse resin, making it easier for water-based crazy horse resin to combine with the surface of leather fibers to form a soft and durable coating, while retaining the unique smooth touch and retro texture of crazy horse leather.

[0012] In one technical solution of the present invention, the solid content of the water-based crazy horse resin is 30%-60%; and / or the viscosity of the water-based crazy horse resin is 100mPa·s-2000mPa·s; and / or the particle size of the water-based crazy horse resin is 0.1μm-1μm; and / or the degradation rate of the water-based crazy horse resin to methylene blue is not less than 95%.

[0013] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: solid content refers to the proportion of non-volatile solid components in the resin system. The use of water-based crazy horse resin with a solid content of 30%-60% can reduce the evaporation time of water in coating construction, improve coating efficiency, ensure that the dry film formed after each coating is thicker, and enhance the wear resistance, waterproofness and adhesion of the coating; the viscosity is in the range of 100mPa·s-2000mPa·s, which can make the water-based crazy horse resin have good fluidity and be easy to be evenly coated on the leather surface by brushing, spraying or rolling, avoiding the problem of uneven coating thickness; the particle size of the water-based crazy horse resin is in the range of 0.1μm-1μm, the particles are evenly dispersed, the formed coating is smoother, the roughness caused by particle agglomeration is reduced, it can better penetrate into the leather fiber, and it is more closely combined with the substrate, and the coating adhesion is improved; the degradation rate of the water-based crazy horse resin to methylene blue is not less than 95%, indicating that the coating can efficiently decompose organic pollutants under light, making the crazy horse leather more stain-resistant during use and reducing cleaning and maintenance costs.

[0014] To achieve the second object of the present invention, the present invention also provides a method for preparing a water-based crazy horse resin, which is used to prepare a water-based crazy horse resin as described in any one of the above technical solutions, and the preparation method comprises the following steps:

[0015] S100, stirring and mixing the polyester resin, the modified crazy horse resin and the emulsifier to form a uniform first mixed liquid;

[0016] S200, adding a photocatalyst and a solvent to the first mixed liquid to obtain a second mixture;

[0017] S300, gradually adding water into the second mixture, and continuously stirring to obtain water-based crazy horse resin.

[0018] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: the resin and the emulsifier are fully mixed by strong stirring to form a stable emulsion base, avoiding stratification or agglomeration. The introduction of the emulsifier improves the compatibility of the resin with the leather surface, ensuring the close adhesion of the coating. The reasonable combination of the polyester resin and the modified crazy horse resin makes the coating flexible, wear-resistant and waterproof. The introduction of a photocatalyst decomposes surface pollutants under light, making the crazy horse leather have self-cleaning ability. The use of a solvent promotes the uniform dispersion of the photocatalyst, avoiding particle agglomeration, thereby improving the catalytic activity. The solvent also reduces the viscosity of the mixture, making it easier to Coating has better leveling properties and avoids brush marks or bubbles; water is used as a dispersion medium, and the system is gradually diluted and emulsified during the gradual addition process. Gradual addition of water and continuous stirring ensure the uniformity of emulsion formation and prevent insoluble particles from settling or stratifying. Continuous stirring ensures system stability and avoids phase separation or precipitation. The final water-based crazy horse resin has moderate viscosity and uniform particle size distribution, and the formed coating is smoother and more delicate without obvious granularity or defects. The water-based crazy horse resin coating prepared by the preparation method of the water-based crazy horse resin in the present invention has wear resistance, flexibility, water resistance and self-cleaning properties, and also has a high-quality appearance effect.

[0019] In a technical solution of the present invention, in step S100, the modified crazy horse resin is prepared by the following method:

[0020] S110, dissolving crazy horse resin in ethyl acetate to form a uniform oil phase; dissolving an emulsifier in deionized water to form a water phase;

[0021] S120, using a phase inversion method, slowly adding the oil phase to the stirred water phase to form a stable pre-emulsion;

[0022] S130, stirring under the protection of inert gas, adding an initiator to the pre-emulsion, and maintaining stirring, adding an alkaline solution to prepare a modified crazy horse resin.

[0023] Compared with the prior art, the technical effects achieved by the technical scheme are as follows: the crazy horse resin is dissolved in ethyl acetate to form a uniform oil phase, which is conducive to dispersion and subsequent emulsification; the emulsifier is dissolved in deionized water to form an aqueous phase, which improves the hydrophilicity of the system; the phase inversion method gradually controls the phase separation process to make the emulsion particle size uniformly distributed in the range of micrometers to nanometers, optimizes the coating performance, and the stable pre-emulsion effectively prevents the aggregation or separation of the oil phase particles, improves the storage and use stability of the modified crazy horse resin; by gradually introducing the oil phase, the crazy horse resin molecules are more evenly dispersed in the aqueous phase to avoid defects in the film forming process; inert gas protection can avoid the interference of oxygen in the system, protect the emulsion system from oxidation, and help improve the chemical stability of the modified crazy horse resin; through the action of the initiator, a polymerization or cross-linking reaction is initiated, and the three-dimensional network structure formed by cross-linking makes the coating more wear-resistant and scratch-resistant, and further stabilizes the pre-emulsion; the introduction of the alkaline solution adjusts the pH value of the emulsion, promotes the molecular activity of the emulsifier, and may trigger further modification reactions of the resin, improve the adhesion and glossiness of the coating, and help improve the waterproof and anti-fouling properties.

[0024] In one technical solution of the present invention, in step S110, the mass ratio of crazy horse resin to ethyl acetate is 1:(0.5-1.5); and / or in step S110, the mass ratio of deionized water to emulsifier is 1:(0.5%-15%); and / or in step S120, the mass ratio of oil phase to water phase is 1:(0.5-2.5); and / or in step S120, the stirring speed is 800rmp-2000rpm; and / or in step S130, the temperature is within 50℃-100℃; and / or in step S130, the initiator includes potassium persulfate or an azo initiator; and / or in step S130, the stirring speed is 350rmp-650rpm.

[0025] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: in step S110, the mass ratio of crazy horse resin to ethyl acetate is 1:(0.5-1.5), ethyl acetate can effectively dissolve crazy horse resin to form a uniform and stable oil phase, and avoid particle precipitation or separation; the mass ratio of deionized water to emulsifier is 1:(0.5%-15%), which can form a stable oil-in-water structure and avoid agglomeration or separation of oil phase particles; in step S120, the mass ratio of oil phase to water phase is 1:(0.5-2.5), and by adjusting the oil-water ratio, the size of the emulsion particles can be controlled to meet different coating performance requirements, avoid phase separation during the emulsification process, ensure that the emulsion has long-term storage stability, and can optimize film-forming performance; the stirring speed is 800rmp-2000rpm, which can reduce the particle size and make the emulsion more uniform , preventing bubbles from being generated due to excessive speed or insufficient emulsification due to excessive slowness; in step S130, the temperature is within 50°C-100°C, which can enhance the activity of the initiator, accelerate the polymerization and cross-linking reactions, and form a more stable modified resin structure, while avoiding excessively high temperatures that lead to emulsion decomposition or insufficient initiator activity due to excessively low temperatures, so that the weather resistance and mechanical properties of the coating are optimized; the initiator includes potassium persulfate or azo initiators, which can generate free radicals at a relatively low temperature to initiate polymerization reactions, are highly efficient and have low energy consumption, and can increase the cross-linking density of the resin; the stirring speed is between 350rpm-650rpm, and low-speed stirring can gently disperse the initiator and maintain the stability of the emulsion, avoid high-speed stirring that destroys the emulsion particles, ensure that the initiation reaction can proceed evenly, ensure that the modified resin has consistent performance, and the coating exhibits better wear resistance and adhesion.

[0026] In a technical solution of the present invention, in step S200, the photocatalyst is titanium dioxide, which is prepared by the following method:

[0027] S210, mixing anhydrous ethanol and tetraisopropyl titanate to obtain a first solution; mixing anhydrous ethanol and deionized water to obtain a second solution;

[0028] S220, then slowly adding the first solution and hydrochloric acid to the second solution under continuous stirring, and continuing to stir after the addition is complete to obtain a third solution;

[0029] S230, heating the third solution, drying it and performing heat treatment to obtain titanium dioxide.

[0030] Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: using titanium dioxide as a photocatalyst can not only decompose organic pollutants under light to form a protective layer and reduce the influence of light aging, but also improve the anti-ultraviolet performance of leather. The preparation method of titanium dioxide of the present invention uses reasonable hydrolysis and heat treatment processes to make the particle size of titanium dioxide particles evenly distributed in the nanometer range, providing a higher specific surface area. The heat treatment ensures that the titanium dioxide presents a highly active anatase crystal form or a mixed crystal form, significantly improving the ability to degrade organic pollutants, and giving titanium dioxide a stronger light absorption ability, especially in the ultraviolet light range, and the catalytic degradation efficiency is higher. The titanium dioxide prepared by the preparation method of titanium dioxide of the present invention can form uniformly dispersed nanoparticles that can form a stable suspension in water-based crazy horse resin to avoid precipitation or agglomeration. The chemically stable titanium dioxide is not easy to degrade or fail, and can maintain self-cleaning, anti-fouling and antibacterial functions for a long time.

[0031] In one technical solution of the present invention, in step S210, the mass ratio of anhydrous ethanol to tetraisopropyl titanate is (4-10) 1; and / or in step S210, the mass ratio of anhydrous ethanol to deionized water is 1:(1-4); and / or in step S220, the stirring speed is 200rmp-600rpm; and / or in step S230, the heating temperature is 80℃-100℃.

[0032] Compared with the prior art, the technical effect achieved by adopting the technical solution is as follows: in step S210, the mass ratio of anhydrous ethanol to tetraisopropyl titanate is (4-10):1, which can not only better dissolve tetraisopropyl titanate and ensure the uniformity of the system, but also reduce the local concentration difference of the hydrolysis reaction, avoid the formation of large particles or agglomeration, and ensure the formation of uniform and controllable nanoparticles by controlling the amount of solvent; the mass ratio of anhydrous ethanol to deionized water is 1:(1-4), which can accelerate the hydrolysis of titanate to form small and uniform particles; and the lower water content delays the reaction, ensures the controllability of the reaction, and the reasonable water content optimizes the dispersion state of the precursor to prevent particles from forming. particle agglomeration or precipitation; in step S220, the stirring speed is 200rpm-600rpm. At an appropriate stirring speed, sufficient shear force can be provided to break up the particle aggregation, ensure that the added reaction solution is evenly distributed, avoid local overconcentration or incomplete reaction, and form a precursor with consistent particle size; in step S230, the heating temperature is 80℃-100℃, which can not only promote the formation of the crystal structure of titanium oxide and lay the foundation for subsequent heat treatment, but also accelerate the reaction rate, further improve the uniformity of particle distribution, contribute to the evaporation of anhydrous ethanol and other volatile substances, and prevent impurity residues from affecting the final titanium dioxide performance.

[0033] In one technical solution of the present invention, in step S100, the emulsifier includes one or more of water-soluble anionic emulsifiers, cationic emulsifiers, nonionic emulsifiers, amphoteric emulsifiers, and compound emulsifiers; and / or in step S200, the solvent includes one or more of propylene glycol methyl ether, propylene glycol butyl ether, and diethylene glycol butyl ether.

[0034] Compared with the prior art, the technical effects achieved by adopting this technical solution are as follows: the use of the above-mentioned types of emulsifiers can significantly improve the stability of the crazy horse resin emulsion, avoid stratification and particle precipitation, and ultimately improve the comprehensive performance of the crazy horse leather; the use of the above-mentioned types of solvents can adjust the solubility and film-forming properties of the crazy horse resin, making the coating surface smoother and more wear-resistant, making the coating performance of the crazy horse resin better, and more firmly bonded to the leather substrate, thereby extending the service life of the leather.

[0035] In one technical solution of the present invention, in step S100, the mass ratio of polyester resin, modified crazy horse resin and emulsifier is (5-7):(2-4):1; and / or in step S200, the mass ratio of the first mixed liquid and photocatalyst and solvent is 100:(1-5):(1-5).

[0036] Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: in step S100, the mass ratio of polyester resin, modified crazy horse resin and emulsifier is (5-7): (2-4): 1. Polyester resin, modified crazy horse resin and emulsifier are the core components of water-based crazy horse resin emulsion, and their mass ratio directly affects the component distribution, stability and functional properties of the emulsion. Polyester resin provides the main chain structure, and modified crazy horse resin supplements the flexibility and adhesion performance. The synergistic effect of the two makes the emulsion more stable. A higher proportion of emulsifier ensures that the oil phase and the water phase are evenly dispersed, preventing the emulsion from stratification or agglomeration. In step S200, the mass ratio of the first mixed liquid to the photocatalyst and the solvent is 100: (1-5): (1-5). The addition ratio of the photocatalyst and the solvent directly affects the photocatalytic performance, self-cleaning effect and leveling and dispersibility of the coating. The appropriate addition of the photocatalyst and the solvent will not destroy the stability of the first mixed liquid. On the contrary, it will make the emulsion easier to construct and store by reducing the viscosity and improving the dispersibility.

[0037] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0038] 1. The water-based crazy horse resin of the present invention has excellent wear resistance, adhesion and flexibility by optimizing material selection and proportion, and also has excellent UV resistance, anti-aging effect, self-cleaning, anti-fouling and low maintenance performance, and at the same time has environmental protection and safety performance, meets the requirements of modern green manufacturing, and can adapt to a variety of application scenarios;

[0039] 2. Using ethyl acetate to modify the crazy horse resin can reduce the cohesive energy density of the resin, adjust the polarity of the crazy horse resin, reduce the viscosity of the crazy horse resin, and optimize the molecular structure of the crazy horse resin, thereby increasing the crosslinking density and toughness of the water-based crazy horse resin, making it easier for the water-based crazy horse resin to combine with the surface of leather fibers to form a soft and durable coating, while retaining the unique smooth touch and retro texture of crazy horse leather;

[0040] 3. The preparation method of the water-based crazy horse resin of the present invention decomposes surface pollutants under light by introducing a photocatalyst, so that the crazy horse leather has self-cleaning ability. The use of a solvent promotes the uniform dispersion of the photocatalyst and avoids particle agglomeration, thereby improving the catalytic activity. The solvent also reduces the viscosity of the mixture, making it easier to apply and having better leveling properties, while avoiding the appearance of brush marks or bubbles. The uniform dispersion of the photocatalyst improves the stability of the coating and avoids the aging problem caused by local accumulation of the photocatalyst.

[0041] 4. The water-based crazy horse resin coating prepared by the preparation method of the water-based crazy horse resin in the present invention has wear resistance, flexibility, water resistance and self-cleaning properties, and also has a high-quality appearance effect. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the related art, since the surface of traditional crazy horse leather products is mostly matte, pollutants are difficult to remove and the cleaning process may damage the texture of the leather. The water-based crazy horse resin used as a coating mainly focuses on wear resistance and cannot meet consumers' demand for its cleaning ability. In view of this, there is an urgent need to provide a water-based crazy horse resin with better cleaning ability and a preparation method thereof.

[0044] Specifically, an embodiment of the present invention provides a water-based crazy horse resin, which includes, by mass, 30-40 parts of polyester resin; 10-20 parts of the modified crazy horse resin; 1-5 parts of photocatalyst; 5-10 parts of emulsifier; 5-10 parts of solvent; 39-50 parts of water; wherein the photocatalyst includes titanium dioxide.

[0045] Preferably, the water-based crazy horse resin of the present invention, through a specific material combination, ensures the wear resistance of the water-based crazy horse resin while giving the water-based crazy horse resin self-cleaning ability. The polyester resin has excellent mechanical properties, provides good adhesion and wear resistance, and makes the crazy horse resin more firmly on the leather surface and not easy to peel off; the modified crazy horse resin provides stronger flexibility and elasticity, and has better compatibility with the leather substrate, so that the coating is not easy to crack or fall off; the photocatalyst can make the crazy horse resin produce free radicals with strong oxidizing ability under light, decompose stains and organic matter attached to the leather surface, thereby enhancing the self-cleaning function of the leather surface and reducing maintenance costs. The photocatalyst uses titanium dioxide, which can not only decompose organic pollutants under light to form a protective layer and reduce the influence of light aging, but also improve the UV resistance of the leather, prevent fading, hardening and brittleness caused by sunlight, and prolong the life of the leather. Prolong the service life of the product; the emulsifier can provide system stability for the water-based crazy horse resin, so that the polyester resin and the modified crazy horse resin are evenly dispersed in the water phase, ensuring the coating uniformity of the product, and can also improve the construction performance, reduce problems such as bubbles and shrinkage holes, and ensure the flatness and appearance of the coating; the use of a small amount of solvent can optimize the film-forming and coating properties, and avoid the environmental pollution and health hazards caused by traditional solvent-based resins; water is used as the main dispersion medium to greatly reduce VOC (volatile organic compound) emissions, which meets environmental protection and safe production requirements; the water-based crazy horse resin of the present invention optimizes material selection and proportion, and not only has excellent wear resistance, adhesion and flexibility, but also has excellent UV resistance, anti-aging effect, self-cleaning, anti-fouling and low maintenance performance, while also having environmental protection and safety performance, meeting modern green manufacturing requirements, and can adapt to a variety of application scenarios.

[0046] Preferably, the present invention also provides a method for preparing a water-based crazy horse resin, the preparation method comprising the following steps:

[0047] S100, mixing stage: stirring and mixing the polyester resin, the modified crazy horse resin and the emulsifier to form a uniform first mixed liquid;

[0048] S200, adding a photocatalyst and a solvent to the first mixed liquid to obtain a second mixture;

[0049] S300, gradually adding water into the second mixture, and continuously stirring to obtain water-based crazy horse resin.

[0050] Preferably, polyester resin is used as the main film-forming substance to provide the coating with flexibility and wear resistance, and the modified crazy horse resin gives the coating additional properties through special functions such as softness and water resistance. The emulsifier can effectively reduce the interfacial tension between the components to make the system uniform and stable. The resin and the emulsifier are fully mixed by strong stirring to form a stable emulsion base to avoid stratification or agglomeration. The introduction of the emulsifier improves the compatibility of the resin with the leather surface and ensures the close adhesion of the coating. The reasonable combination of the polyester resin and the modified crazy horse resin makes the coating have flexibility, wear resistance and water resistance; the photocatalyst gives the water-based crazy horse resin self-cleaning properties, and the solvent can adjust the viscosity of the system, improve the dispersibility and optimize the film-forming properties. By introducing the photocatalyst to decompose surface pollutants under light, the crazy horse leather has self-cleaning ability. The use of the solvent promotes the uniform dispersion of the photocatalyst, avoids particle agglomeration, and thus improves the catalytic activity. The solvent also reduces the viscosity of the mixture, making it It is easier to apply and has better leveling properties, while avoiding brush marks or bubbles. The uniform dispersion of the photocatalyst improves the stability of the coating and avoids aging problems caused by local accumulation of the photocatalyst. Water is used as a dispersion medium, and the system is gradually diluted and emulsified during the gradual addition process. By using water as a dispersion medium, the use of organic solvents is reduced, VOC emissions are reduced, and environmental protection regulations are met. Gradual addition of water and continuous stirring ensure the uniformity of emulsion formation, prevent insoluble particles from settling or stratifying, facilitate process adjustment during industrialization, and improve production stability and adaptability. Continuous stirring ensures system stability and avoids phase separation or precipitation. The final water-based crazy horse resin has moderate viscosity and uniform particle size distribution, and the formed coating is smoother and more delicate, without obvious granularity or defects. The water-based crazy horse resin coating prepared by the preparation method of the water-based crazy horse resin in the present invention has wear resistance, flexibility, water resistance and self-cleaning properties, and also has a high-quality appearance effect.

[0051] Furthermore, titanium dioxide is prepared by the following method:

[0052] S210, mixing anhydrous ethanol and tetraisopropyl titanate to obtain a first solution; mixing anhydrous ethanol and deionized water to obtain a second solution;

[0053] S220, then slowly adding the first solution and hydrochloric acid to the second solution under continuous stirring, and continuing to stir after the addition is complete to obtain a third solution;

[0054] S230, heating the third solution, drying it and performing heat treatment to obtain titanium dioxide.

[0055] Preferably, titanium dioxide is used as a photocatalyst, which can not only decompose organic pollutants under light to form a protective layer and reduce the impact of light aging, but also improve the UV resistance of leather. In the process of preparing titanium dioxide, due to the good solubility of tetraisopropyl titanate in anhydrous ethanol, uneven reaction or particle agglomeration can be avoided. The system formed by mixing deionized water and anhydrous ethanol can control the hydrolysis rate and prevent titanate from rapidly agglomerating. The separation of the two-step solution preparation process improves the purity and particle size control ability of the final titanium dioxide; by slowly dripping the first solution and hydrochloric acid, the hydrolysis reaction is gradually carried out to avoid local overreaction and ensure uniform particle size. The introduction of hydrochloric acid adjusts the pH value of the solution, inhibits excessive hydrolysis, and promotes the formation of uniformly dispersed titanium dioxide precursors. Continuous stirring and control of the dripping speed prevent particle agglomeration and improve the subsequent dispersibility and photocatalytic efficiency of titanium dioxide; the heat treatment process determines the crystal structure, specific surface area and photocatalytic performance of titanium dioxide. The heat treatment can The invention can control the crystal form of titanium dioxide and optimize its photocatalytic activity. The drying and heat treatment process effectively reduces impurities, makes the surface structure of titanium dioxide more regular, increases the specific surface area, improves the catalytic reaction rate, eliminates organic residues in the precursor by heat treatment, and improves the chemical stability and long-term performance of titanium dioxide. The preparation method of titanium dioxide of the invention makes the particle size of titanium dioxide evenly distributed in the nanometer range through reasonable hydrolysis and heat treatment processes, provides a higher specific surface area, and ensures that titanium dioxide presents a highly active anatase crystal form or a mixed crystal form by heat treatment, significantly improves the ability to degrade organic pollutants, and gives titanium dioxide a stronger light absorption ability, especially in the ultraviolet light range, and the catalytic degradation efficiency is higher. The titanium dioxide prepared by the preparation method of titanium dioxide of the invention can form a stable suspension with uniformly dispersed nanoparticles, avoid precipitation or agglomeration, and the chemically stable titanium dioxide is not easy to degrade or fail, and can maintain self-cleaning, antifouling and antibacterial functions for a long time.

[0056] Preferably, in step S210, the mass ratio of anhydrous ethanol to tetraisopropyl titanate is (4-10):1, which can not only better dissolve tetraisopropyl titanate and ensure the uniformity of the system, but also reduce the local concentration difference of the hydrolysis reaction, avoid the formation of large particles or agglomeration, and ensure the formation of uniform and controllable nanoparticles by controlling the amount of solvent; the mass ratio of anhydrous ethanol to deionized water is 1:(1-4), which can accelerate the hydrolysis of titanate to form small and uniform particles; and the lower water content delays the reaction and ensures the controllability of the reaction. The reasonable water content optimizes the dispersion state of the precursor and prevents the particles from agglomerating or precipitating. The uniformly distributed precursor provides a better starting state for the subsequent heat treatment and ensures the uniformity of the final titanium dioxide particles.

[0057] In step S220, the rotation speed of the stirring treatment is between 200rpm and 600rpm. By adjusting the stirring speed during the dropping process, the uniformity of the mixing of the oil phase and the water phase and the formation of the precursor particles are affected. At an appropriate stirring speed, sufficient shear force can be provided to break up the particle aggregation, ensure that the dropped reaction solution is evenly distributed, avoid local overconcentration or incomplete reaction, and form a precursor with a uniform particle size. In addition, a lower stirring speed prevents the introduction of too many bubbles and avoids the impact on the subsequent drying and heat treatment process. The heating treatment temperature is between 80°C and 100°C, which can not only promote the formation of the crystal structure of titanium oxide and lay the foundation for subsequent heat treatment, but also accelerate the reaction rate, further improve the uniformity of particle distribution, and contribute to the evaporation of anhydrous ethanol and other volatile substances, and prevent impurity residues from affecting the final titanium dioxide performance.

[0058] Further, in step S100, the modified crazy horse resin is modified by ethyl acetate, and the modified crazy horse resin is prepared by the following method:

[0059] S110, dissolving crazy horse resin in ethyl acetate to form a uniform oil phase; dissolving an emulsifier in deionized water to form a water phase;

[0060] S120, using a phase inversion method, slowly adding the oil phase to the stirred water phase to form a stable pre-emulsion;

[0061] S130, stirring under the protection of inert gas, adding an initiator to the pre-emulsion, and maintaining stirring, adding an alkaline solution to prepare a modified crazy horse resin.

[0062] Preferably, the crazy horse resin is dissolved in ethyl acetate to form a uniform oil phase, which is conducive to dispersion and subsequent emulsification. The emulsifier is dissolved in deionized water to form an aqueous phase, which improves the hydrophilicity of the system. The good solubility of the crazy horse resin in ethyl acetate ensures that the oil phase is uniform and avoids agglomeration or precipitation. The combination of the emulsifier and deionized water reduces the tension of the oil-water interface, providing good conditions for the subsequent emulsification process. Separating the oil phase and the aqueous phase can more efficiently control the emulsification conditions and avoid unevenness when the phases are mixed. The phase inversion method gradually changes the system from the oil phase as the continuous phase to the aqueous phase as the continuous phase by slowly adding the oil phase to the aqueous phase. The phase inversion method gradually controls the phase separation process so that the particle size of the emulsion particles is evenly distributed in the range of micrometers to nanometers, optimizes the coating performance, and the stable pre-emulsion effectively prevents the aggregation or separation of the oil phase particles, improves the storage and use stability of the modified crazy horse resin, and gradually introduces the oil phase , making the crazy horse resin molecules more evenly dispersed in the water phase, avoiding defects in the film-forming process; inert gas protection can avoid the interference of oxygen in the system, protect the emulsion system from oxidation, and help improve the chemical stability of the modified crazy horse resin, especially under long-term storage or photocatalytic conditions, to extend the service life of the coating. Nitrogen is preferably used as the inert gas; through the action of the initiator, polymerization or cross-linking reaction is initiated, and the three-dimensional network structure formed by cross-linking makes the coating more wear-resistant and scratch-resistant, and further stabilizes the pre-emulsion, which can significantly enhance the weather resistance, solvent resistance and hydrolysis resistance of the resin. The introduction of alkaline solution adjusts the pH value of the emulsion, promotes the molecular activity of the emulsifier, and may trigger further modification reactions of the resin. The alkaline environment helps to reduce the risk of emulsion decomposition under acidic conditions, improves storage stability, improves the adhesion and glossiness of the coating, and helps to improve the waterproof and anti-fouling properties.

[0063] Preferably, in step S110, the mass ratio of crazy horse resin to ethyl acetate is 1:(0.5-1.5), ethyl acetate can effectively dissolve crazy horse resin to form a uniform and stable oil phase, avoid particle precipitation or separation, optimize the fluidity of the oil phase and subsequent emulsification performance, reduce the difficulty of emulsification, ensure that the oil phase particles are small, and help to form uniform emulsion particles; the mass ratio of deionized water to emulsifier is 1:(0.5%-15%), the effect of the amount of emulsifier on reducing the oil-water interfacial tension directly affects the emulsification efficiency and stability, can form a stable oil-in-water structure, and avoid agglomeration or separation of oil phase particles;

[0064] In step S120, the mass ratio of the oil phase to the water phase is 1:(0.5-2.5). The ratio of the oil phase to the water phase directly determines the dispersion state and stability of the emulsion particles. By adjusting the oil-water ratio, the size of the emulsion particles can be controlled to meet the performance requirements of different coatings, avoid phase separation during the emulsification process, ensure that the emulsion has long-term storage stability, and optimize the film-forming performance; the stirring speed is 800rmp-2000rpm, which can reduce the particle size, make the emulsion more uniform, prevent the generation of bubbles due to too fast speed or insufficient emulsification due to too slow speed, destroy the agglomeration of the oil phase particles through high-speed shear force, and enhance the stability of the emulsion during storage;

[0065] In step S130, the temperature is within the range of 50°C-100°C, which can enhance the activity of the initiator, accelerate the polymerization and cross-linking reactions, form a more stable modified resin structure, and avoid too high a temperature causing emulsion decomposition or too low a temperature causing insufficient initiator activity, so that the weather resistance and mechanical properties of the coating are optimized; the initiator includes potassium persulfate or an azo initiator, which can generate free radicals at a relatively low temperature to initiate a polymerization reaction, are highly efficient and have low energy consumption, can increase the cross-linking density of the resin, enhance the mechanical properties and chemical stability of the coating, and have good compatibility without affecting the stability of the emulsion; the stirring speed is between 350rpm-650rpm, and during the initiator addition and modification reaction stages, an appropriate stirring speed ensures that the emulsion is uniform, while avoiding excessive bubbles, and avoiding holes or rough surfaces after film formation, and low-speed stirring can gently disperse the initiator and maintain the stability of the emulsion, avoid high-speed stirring that destroys the emulsion particles, ensure that the initiation reaction can proceed uniformly, ensure that the modified resin has consistent performance, and the coating exhibits better wear resistance and adhesion.

[0066] Preferably, in step S100, the emulsifier includes one or more of a water-soluble anionic emulsifier, a cationic emulsifier, a nonionic emulsifier, an amphoteric emulsifier, and a compound emulsifier. The anionic emulsifier stabilizes the dispersion through its negatively charged hydrophilic group, can enhance the stability of the system, prevent particle agglomeration, thereby improving the uniformity of the water-based crazy horse resin and improving the stability of the emulsion; the cationic emulsifier combines the positively charged hydrophilic group with the acidic group, is suitable for specific surface activity requirements, can improve the adhesion between the crazy horse resin and the leather substrate, thereby improving the wettability and permeability of the coating on the leather surface; the hydrophilic group of the nonionic emulsifier interacts with water through hydrogen bonding and can be more adaptable to the water phase. Strong, suitable for a variety of solvent systems, thereby improving the uniformity and flexibility of the coating; amphoteric emulsifiers have both anionic and cationic groups, can adjust performance according to pH changes, and can have good emulsification effects under acidic or alkaline conditions, thereby enhancing the compatibility of crazy horse resin emulsions and adapting to a variety of leather processes; compound emulsifiers improve performance through the synergistic effect of different emulsifiers, and can combine the advantages of the above single emulsifiers to further improve the stability, dispersibility and compatibility of the system, thereby more widely adapting to a variety of process conditions and improving the functionality of the emulsion. By using one or more of the above emulsifiers, the stability of the crazy horse resin emulsion can be significantly improved, stratification and particle precipitation can be avoided, and ultimately the comprehensive performance of crazy horse leather can be improved;

[0067] In step S200, the solvent includes one or more of propylene glycol methyl ether, propylene glycol butyl ether, and diethylene glycol butyl ether. Propylene glycol methyl ether is a high-efficiency organic solvent with moderate volatility and excellent solubility, which can improve the dispersion effect of crazy horse resin, prevent particle aggregation, enhance the adhesion between resin and leather, make the coating smoother and more uniform, and has a slow volatilization rate, which is helpful for the film-forming process; propylene glycol butyl ether has a moderate volatilization rate and stronger lipophilicity, and is suitable for systems with higher affinity requirements. It can enhance the wetting properties of modified crazy horse resin and leather substrate, optimize the leveling of the coating, reduce coating surface defects, and increase The flexibility of the system is increased, making the finished leather feel better; diethylene glycol butyl ether has a higher boiling point and a lower evaporation rate, which can significantly improve the stability of the solution, delay the evaporation of the solvent, improve the fluidity and uniformity of the coating, enhance the bonding between the coating and the leather substrate, improve durability, provide excellent anti-foaming effect, and reduce coating defects; one or more of the above-mentioned types of solvents are used to adjust the solubility and film-forming properties of the crazy horse resin, making the coating surface smoother and more wear-resistant, making the coating performance of the crazy horse resin better, and combining more firmly with the leather substrate, thereby extending the service life of the leather.

[0068] Preferably, in step S100, the mass ratio of polyester resin, modified crazy horse resin and emulsifier is (5-7): (2-4): 1. Polyester resin, modified crazy horse resin and emulsifier are the core components of water-based crazy horse resin emulsion, and their mass ratio directly affects the component distribution, stability and functional properties of the emulsion. Polyester resin provides the main chain structure, and modified crazy horse resin supplements flexibility and adhesion performance. The synergistic effect of the two makes the emulsion more stable. A higher proportion of emulsifier ensures uniform dispersion of oil phase and water phase, and prevents emulsion stratification or agglomeration. When the proportion of polyester resin is 5-7, the coating exhibits good hardness and wear resistance. When the proportion of modified crazy horse resin is 2-4, it helps to improve the flexibility of the coating and the leather touch, while improving the bonding strength with the substrate.

[0069] In step S200, the mass ratio of the first mixed liquid to the photocatalyst and the solvent is 100:(1-5):(1-5). The addition ratio of the photocatalyst and the solvent directly affects the photocatalytic performance, self-cleaning effect, and leveling and dispersibility of the coating. When the ratio of the photocatalyst is 1-5, the activity of titanium dioxide can be effectively guaranteed, while avoiding the covering effect caused by excessive amount, ensuring that the coating has excellent photocatalytic degradation performance. When the solvent ratio is 1-5, it can provide sufficient dispersibility to ensure uniform distribution of the photocatalyst, and will not excessively affect the solid content and drying rate of the coating. It can also improve the leveling of the coating, make the coating surface smoother, and reduce pinholes or defects. The appropriate addition of the photocatalyst and the solvent will not destroy the stability of the first mixed liquid. On the contrary, it will make the emulsion easier to construct and store by reducing viscosity and improving dispersibility.

[0070] Embodiment 1

[0071] This embodiment provides a water-based crazy horse resin, which includes, by weight, 30 parts of polyester resin, 10 parts of modified crazy horse resin, 1 part of photocatalyst, 5 parts of emulsifier, 5 parts of solvent, and 39 parts of water. The particle size of the water-based crazy horse resin is 0.1 μm, and the photocatalyst includes titanium dioxide. The preparation method of the water-based crazy horse resin adopts the following steps:

[0072] S100, stirring and mixing the polyester resin, the modified crazy horse resin and the anionic emulsifier in a mass ratio of 5:2:1 to form a uniform first mixed liquid;

[0073] S200, adding titanium dioxide and propylene glycol methyl ether to the first mixed liquid, wherein the mass ratio of the first mixed liquid to titanium dioxide and propylene glycol methyl ether is 100:1:1, to obtain a second mixture;

[0074] S300, gradually adding water to the second mixture, and continuously stirring to obtain a water-based crazy horse resin;

[0075] Modified crazy horse resin and titanium dioxide were purchased from outside.

[0076] Embodiment 2

[0077] This embodiment provides a water-based crazy horse resin, which includes, by weight, 40 parts of polyester resin, 20 parts of modified crazy horse resin, 5 parts of photocatalyst, 10 parts of emulsifier, 10 parts of solvent, and 50 parts of water. The particle size of the water-based crazy horse resin is 1 μm, and the photocatalyst includes titanium dioxide. The preparation method of the water-based crazy horse resin adopts the following steps:

[0078] S100, stirring and mixing the polyester resin, the modified crazy horse resin and the cationic emulsifier in a mass ratio of 7:4:1 to form a uniform first mixed solution;

[0079] S200, adding titanium dioxide and propylene glycol butyl ether to the first mixed liquid, wherein the mass ratio of the first mixed liquid to titanium dioxide and propylene glycol butyl ether is 100:5:5, to obtain a second mixture;

[0080] S300, gradually adding water to the second mixture, and continuously stirring to obtain a water-based crazy horse resin;

[0081] Wherein, titanium dioxide is purchased from outside, and the modified crazy horse resin is modified by ethyl acetate, and the modified crazy horse resin is prepared by the following method:

[0082] S110, dissolving crazy horse resin in ethyl acetate, the mass ratio of crazy horse resin to ethyl acetate being 1:0.5, and forming a uniform oil phase after dissolution; dissolving emulsifier in deionized water, the mass ratio of deionized water to emulsifier being 1:0.5%, and forming a water phase;

[0083] S120, using a phase inversion method, slowly adding the oil phase to the stirred water phase, the mass ratio of the oil phase to the water phase being 1:0.5, and the stirring speed being 800 rpm, to form a stable pre-emulsion;

[0084] S130, adding potassium sulfate to the pre-emulsion at 50° C. and stirring at a speed of 350 rpm under nitrogen protection, and maintaining stirring, adding alkaline solution to prepare a modified crazy horse resin.

[0085] Embodiment 3

[0086] This embodiment provides a water-based crazy horse resin, which includes, by weight, 35 parts of polyester resin, 15 parts of modified crazy horse resin, 3 parts of photocatalyst, 8 parts of emulsifier, 8 parts of solvent, and 45 parts of water. The particle size of the water-based crazy horse resin is 0.5 μm, and the photocatalyst includes titanium dioxide. The preparation method of the water-based crazy horse resin adopts the following steps:

[0087] S100, stirring and mixing the polyester resin, the modified crazy horse resin, and the mixture of the anionic emulsifier, the cationic emulsifier, and the nonionic emulsifier in a mass ratio of 6:3:1 to form a uniform first mixed solution;

[0088] S200, adding titanium dioxide and a mixture of propylene glycol butyl ether and diethylene glycol butyl ether to the first mixed liquid, wherein the mass ratio of the first mixed liquid to the mixture of titanium dioxide, propylene glycol butyl ether and diethylene glycol butyl ether is 100:3:3, to obtain a second mixture;

[0089] S300, gradually adding water to the second mixture, and continuously stirring to obtain a water-based crazy horse resin;

[0090] Wherein, the modified crazy horse resin is modified by ethyl acetate, and the modified crazy horse resin is prepared by the following method:

[0091] S110, dissolving crazy horse resin in ethyl acetate, the mass ratio of crazy horse resin to ethyl acetate being 1:1.5, and forming a uniform oil phase after dissolution; dissolving emulsifier in deionized water, the mass ratio of deionized water to emulsifier being 1:15%, and forming a water phase;

[0092] S120, using a phase inversion method, slowly adding the oil phase to the stirred water phase, the mass ratio of the oil phase to the water phase being 1:2.5, and the stirring speed being 2000 rpm, to form a stable pre-emulsion;

[0093] S130, adding an azo initiator to the pre-emulsion at 100° C. and stirring at a speed of 650 rpm under nitrogen protection, and maintaining stirring, adding an alkaline solution to prepare a modified crazy horse resin;

[0094] Titanium dioxide was prepared by the following method:

[0095] S210, mixing anhydrous ethanol and tetraisopropyl titanate in a mass ratio of 4:1 to obtain a first solution; mixing anhydrous ethanol and deionized water in a mass ratio of 1:1 to obtain a second solution;

[0096] S220, then slowly adding the first solution and hydrochloric acid to the second solution while continuing to stir at a speed of 200 rpm, and continuing to stir after the addition is complete to obtain a third solution;

[0097] S230, heating the third solution at 80°C, drying and heat treating the solution to obtain titanium dioxide.

[0098] Embodiment 4

[0099] This embodiment provides a water-based crazy horse resin, which includes, by weight, 35 parts of polyester resin, 15 parts of modified crazy horse resin, 3 parts of photocatalyst, 8 parts of emulsifier, 8 parts of solvent, and 45 parts of water. The particle size of the water-based crazy horse resin is 0.5 μm, and the photocatalyst includes titanium dioxide. The preparation method of the water-based crazy horse resin adopts the following steps:

[0100] S100, stirring and mixing the polyester resin, the modified crazy horse resin, and the mixture of the anionic emulsifier, the cationic emulsifier, and the nonionic emulsifier in a mass ratio of 6:3:1 to form a uniform first mixed solution;

[0101] S200, adding titanium dioxide and a mixture of propylene glycol butyl ether and diethylene glycol butyl ether to the first mixed liquid, wherein the mass ratio of the first mixed liquid to the mixture of titanium dioxide, propylene glycol butyl ether and diethylene glycol butyl ether is 100:3:3, to obtain a second mixture;

[0102] S300, gradually adding water to the second mixture, and continuously stirring to obtain a water-based crazy horse resin;

[0103] Wherein, the modified crazy horse resin is modified by ethyl acetate, and the modified crazy horse resin is prepared by the following method:

[0104] S110, dissolving crazy horse resin in ethyl acetate, wherein the mass ratio of crazy horse resin to ethyl acetate is 1:1.2, and a uniform oil phase is formed after dissolution; dissolving emulsifier in deionized water, wherein the mass ratio of deionized water to emulsifier is 1:10%, and a water phase is formed;

[0105] S120, using a phase inversion method, slowly adding the oil phase to the stirred water phase, the mass ratio of the oil phase to the water phase being 1:2.0, and the stirring speed being 1800 rpm, to form a stable pre-emulsion;

[0106] S130, adding an azo initiator to the pre-emulsion at 80° C. and stirring at a speed of 450 rpm under nitrogen protection, and maintaining stirring, adding an alkaline solution to prepare a modified crazy horse resin;

[0107] Titanium dioxide was prepared by the following method:

[0108] S210, mixing anhydrous ethanol and tetraisopropyl titanate in a mass ratio of 10:1 to obtain a first solution; mixing anhydrous ethanol and deionized water in a mass ratio of 1:4 to obtain a second solution;

[0109] S220, then slowly dropwise adding the first solution and hydrochloric acid into the second solution while continuing to stir at a speed of 600 rpm, and continuing to stir after the addition is complete to obtain a third solution;

[0110] S230, heating the third solution at a temperature of 100° C., and drying and heat-treating the solution to obtain titanium dioxide.

[0111] Performance Testing

[0112] Solid content test: Take 2 g of the water-based crazy horse resin sample in Example 1-4, place it in a constant weight aluminum dish, dry it in an oven at 105°C to constant weight, and record the residual mass after drying;

[0113] Viscosity test: Using a rotational viscometer, the viscosity of the water-based crazy horse resin in Examples 1-4 was measured at 25°C;

[0114] Test of the photocatalytic degradation rate of methylene blue: prepare a methylene blue aqueous solution with a concentration of 10 ppm, add the water-based crazy horse resin in Example 1-4, place the sample under an ultraviolet light source for 2 hours, use an ultraviolet-visible spectrophotometer with a detection wavelength of 664 nm, and measure the absorbance change of the solution;

[0115] Adhesion test: On the surface of the dried leather coating, use a grid cutter to draw a grid of 1mm×1mm, the depth reaching the substrate, use 3M tape to stick it and then tear it off quickly to observe the coating shedding;

[0116] Wear resistance test: Use Taber wear tester, equipped with CS-17 grinding wheel, with a load of 1000g, to perform 1000 abrasion tests on the coating surface and record the weight loss value;

[0117] The test results are shown in Table 1.

[0118] Table 1

[0119]

[0120] As can be seen from Table 1, the various properties of the water-based crazy horse resin of the present invention are good, especially the water-based crazy horse resin in Example 3 and Example 4, especially the photocatalytic degradation rate of methylene blue. This may be due to the use of titanium dioxide prepared by the preparation method of titanium dioxide recorded in the present invention, thereby greatly improving the self-cleaning ability of the water-based crazy horse resin in Example 3 and Example 4; the various properties of the water-based crazy horse resin in Example 2 are improved compared with the water-based crazy horse resin in Example 1, which may be due to the use of the preparation method of the modified crazy horse resin recorded in the present invention in Example 2, thereby making the water-based crazy horse resin in Example 2 have better various properties.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-based crazy horse resin, characterized in that: The water-based crazy horse resin comprises, by mass: Polyester resin: 30-40 parts; The modified crazy horse resin: 10-20 parts; Photocatalyst: 1-5 parts; Emulsifier: 5-10 parts; Solvent: 5-10 parts; Water: 39-50 parts; Wherein, the photocatalyst comprises titanium dioxide.

2. The resin according to claim 1, characterized in that The modified crazy horse resin is modified by using ethyl acetate.

3. The resin according to claim 1, characterized in that The solid content of the water-based crazy horse resin is 30%-60%; and / or The viscosity of the water-based crazy horse resin is 100 mPa·s-2000 mPa·s; and / or The particle size of the water-based crazy horse resin is 0.1 μm-1 μm; and / or The degradation rate of the water-based crazy horse resin on methylene blue is not less than 95%.

4. A method for preparing a water-based crazy horse resin, characterized in that: The preparation method is used to prepare the water-based crazy horse resin according to any one of claims 1 to 3, and the preparation method comprises the following steps: S100, stirring and mixing the polyester resin, the modified crazy horse resin and the emulsifier to form a uniform first mixed solution; S200, adding the photocatalyst and the solvent to the first mixed liquid to obtain a second mixture; S300, gradually adding the water into the second mixture, and continuously stirring to obtain the water-based crazy horse resin.

5. The preparation method according to claim 4, characterized in that: In step S100, the modified crazy horse resin is prepared by the following method: S110, dissolving crazy horse resin in ethyl acetate to form a uniform oil phase; dissolving an emulsifier in deionized water to form a water phase; S120, using a phase inversion method, slowly adding the oil phase to the stirred water phase to form a stable pre-emulsion; S130, stirring under the protection of inert gas, adding an initiator to the pre-emulsion, and maintaining stirring, adding an alkaline solution to prepare the modified crazy horse resin.

6. The preparation method according to claim 5, characterized in that: In step S110, the mass ratio of the crazy horse resin to the ethyl acetate is 1:(0.5-1.5); and / or In step S110, the mass ratio of the deionized water to the emulsifier is 1:(0.5%-15%); and / or In step S120, the mass ratio of the oil phase to the water phase is 1:(0.5-2.5); and / or In step S120, the stirring speed is 800 rpm-2000 rpm; and / or In step S130, the temperature is within the range of 50°C-100°C; and / or In step S130, the initiator includes potassium persulfate or an azo initiator; and / or In step S130, the stirring speed is 350 rpm-650 rpm.

7. The preparation method according to claim 4, characterized in that: In step S200, the photocatalyst is titanium dioxide, which is prepared by the following method: S210, mixing anhydrous ethanol and tetraisopropyl titanate to obtain a first solution; mixing anhydrous ethanol and deionized water to obtain a second solution; S220, then slowly adding the first solution and hydrochloric acid to the second solution under continuous stirring, and continuing to stir after the addition is complete to obtain a third solution; S230, heating the third solution, drying it and performing heat treatment to obtain the titanium dioxide.

8. The preparation method according to claim 7, characterized in that: In step S210, the mass ratio of the anhydrous ethanol to the tetraisopropyl titanate is (4-10) 1; and / or In step S210, the mass ratio of the anhydrous ethanol to the deionized water is 1:(1-4); and / or In step S220, the stirring process is performed at a speed of 200 rpm to 600 rpm; and / or In step S230, the temperature of the heating treatment is 80°C-100°C.

9. The preparation method according to claim 4, characterized in that: In step S100, the emulsifier includes one or more of anionic emulsifiers, cationic emulsifiers, nonionic emulsifiers, amphoteric emulsifiers, and compound emulsifiers that are soluble in water; and / or In step S200, the solvent includes one or more of propylene glycol methyl ether, propylene glycol butyl ether, and diethylene glycol butyl ether.

10. The preparation method according to claim 4, characterized in that: In step S100, the mass ratio of the polyester resin, the modified crazy horse resin and the emulsifier is (5-7): (2-4): 1; and / or In step S200, the mass ratio of the first mixed liquid to the photocatalyst and the solvent is 100:(1-5):(1-5).

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